The investigators hypothesize that adding bortezomib to salvage regimen of DLBCL will be more efficacious. Increasing the response rate will then allow more eligible patients to go on to autologous stem cell transplantation. The investigators intend to test the tolerability and efficacy of the combination of bortezomib with the R-ICE regimen, and attempt to correlate responses with histopathological and gene expression studies of tumor specimens.